Pet litter mat



FIG. 1 is a top plan view of our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a widthwise side elevational view thereof;

FIG. 4 is a lengthwise side elevational view thereof;

FIG. 5 is a top perspective view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

The ornamental design for a pet litter mat, as shown and described. 